In a controversial proposal Trump Offers Canada Free Entry Into ‘Golden Dome’ Missile Shield If It Becomes 51st State. U.S. President Donald Trump has offered Canada free access to his administration’s ambitious Golden Dome missile defense system—on one striking condition: that Canada becomes the 51st state of the United States. In a meeting between Trump and Canadian Prime Minister Mark Carney on May 6, Carney had said, "As you know from real estate, there are some places that are never for sale."